Burglar-alarm.



J. S. ALDERMAN.

BURGLAR ALARM.

APPLICATION FILED MAR. s. 19%.

1,244,938, Patented Oct. 30, 1917.

2 SHEETS--SHEET I Lqmln.

IEL i J. S. ALDERMAN.

BURGLAR ALARM.

APPLICATION man MAR. 8,19l6.

1,244,938. Patented 0m. 30, 12m,

2 SHEETS-SHEET 2.

wu'nzoowo JOSEPI-I'S. ALDERMAN, F ENNIS, TEXAS.

BURGLARALARM.

Specification of Letters Patent.

Patented Got. 3d, 1917.

Application filed March 8, 1916. Serial No. 82,875.

' To all whom it may concern:

' Be it known that I, Josnrir S. ALDERMAN, a citizen of the United States, residing at Ennis, in the county of Ellis and State of Texas, have invented certain new and useful Improvements in BurglarAlar1ns; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

lhis invention relates to burglar alarms, and has for its primary object to provide a simple and eflicient device of this character adapted to be automatically released by the opening movement ofa window or door to sound an alarm and thus give warning.

/Vith this and other objects in view, the

invention consists in the novel construction, combination and arrangement of parts'as' will be hereinafter specifically described,

claimed and illustrated in the accompanying drawings, in which:

Figure 1 represents a front elevation of a door, illustrating the improved burglar alarm applied to use thereon,

Fig. 2 represents a longitudinal sectional view on the line 22 of Fig. 1,

Fig. 8 represents a horizontal sectional view on the line 3-3 of Fig. 1,

Fig. 4: represents a front elevation of the burglar alarm applied to a window,

Fig. 5 represents a vertical sectional view on the line 55 of Fig. 1, and

Fig. 6 is a perspective view of the firing member.

Referring to the drawing in detail, wherein similar reference numerals designate corresponding parts throughout the several views, the numeral 8 indicates an elongated body member having a relatively wide longitudinal slot 9 adjacent one end thereof connected with a transverse opening 10 formed adjacent the opposite end by a centrally located connecting bore 11'. Adjacent the opposite ends the body or base 8 is formed with apertures 12 disposed in parallel relation to the opening 10 and adapted to receive screws, or equivalent means, whereby the base is secured in position to a door or window frame. A cartridge holder 13 is secured in the bore 11 in the end adj acent the slot 9.

A firing element let is slidably mounted in the relatively wide slot 9 and is provided with a transverse guide pin 15 slidably received within slots 16 formed in the side walls of the slot 9 and disposed at right angles to'the latter. The firing member 14 is provided with reduced lateral extensions 1'7 projecting outwardly of the base 8 and having apertures 18 therein receiving the upper extremities of operating springs 19, the lower ends of which are mounted in apertured ears 20 formed adjacent the lower end of the base 8. A U-shaped strap 21 is connected with the upper portion of the slidable firing member 1 1 and receives one end of a l ver 22, having a longitudinal slot 22 pivotally receiving a pin 23 fastened to a window, door or other suitable supporting frame and adapted to co-act with devices carried by the door or window to retain the firing member 1% in elevated or inoperative position, while the door or window is in closed position. When the alarm is not in use, the lever drops by gravity into the vertical position illustrated in. dotted lines in Fig. 1 and is thus rendered inoperative.

Iii-applying the burglar alarm to use in connection with a swinging door, the base 8 is secured in position upon the door frame ill by screws fitted in the apertures 12 and secured in the door frame. The lever 22 is pivotally secured to the door frame 24: by the screw, or equivalent means, 23 at a point adjacent the upper extremity of the slot 9 in the base, the outer end of the lever being extended through the slot 9 and the strap 21 carried by the iiring element 1%. A plate 25 is rigidly secured adjacent the vertical swinging edge of the door 26 and the outer end 27 thereof is twisted and so arranged that when the door is closed the twisted end 27 is disposed above the adjacent end of the lever 22 and operates to retainthe firing element in elevated or inoperative position against the tension of the operating springs 19. When the door is opened, the twisted end 27 of the plate is moved off of the adjacent end of the lever 22, thus releasing the latter and permitting the firing element 1 1 to move downwardly in the base 8 under the influence of the springs 19, thus forcibly en gaging the firing pin 28 carried by the member 1% into engagement with the blank cartridge 29, exploding the latter and giving an alarm.

In applying the alarm toa window, the base 8 is attached to the window frame 30 and the lever 22 is controlled by angular plates 81 fastened to the lower sash 32.

fiflat I claim is:

1. burglar alarm including a base having a atirely Wide longitudinal slot, a bore eommnnicatmg with the lower end of the slot and a transrerse opening therethrough communicating with the lower end of the bore and constituting an outlet for the latter a. firing element slidahly mounted in the relatirei wide slot and ejecting laterally of the bzise, the-Walls 0 slot 1 aring relatimely nar 2 h I guide pin prot ng l t'the oppr ed sides of the sin-o slidably received in :the slots a tiring pin carried ing a relatively Widelongitudinalslot, a bore communicating with ,the lower end of the bore and constitntinan outlet therefor a ,iiringelement slidably mounted in the relatirel'y Wide slot and projecting laterally of he base, the Walls of the relatively Wide slot being proric ed with relatively narrow slots therein guide pin carried by the firing element slidably received Within the relatively narrow slots, a firing pin carried by I the itiring element, a Cartridge 511016.61 in :the upper end of the bore springsconneeting theiexposed portions of the firing element with the lower portion of the :base and normally ,tending to more rthe firing-element to operatire position, a U-shaped strap connected witlrthe liringielement and a pivoted lever associated with the strap for releasabl; supporting the firing element in inoperative position.

In testimony whereof l atlix my signature in presence of two Witnesses.

JOSEPH S. ALDERMAN Witnesses C. N. :Hexonnsox, .Cnas. H. Jones.

ponies of this patent may be obtained for five cents eaeh, hye dnres sing the Qonrmissioner of Patents, "Washington, Deal 

